Isaac and the Black Sword Knights are responsible for training the Maihama army. While he's in Maihama Isaac gets to know the new crown prince of Maihama, a young boy named Iselus.  Iselus respect looks up to Isaac and respects him.
At a party for the crown prince's birthday, assassin's make an attempt on his life.
From now on, no one can be a ruler 
unless he understands adventurers,
Desde ahora, no se podrá ser un gobernante 
sin entender a los Aventureros y viceversa.
Dorénavant, comprendre les us
des aventuriers sera indispensable
D'ora in poi, nessuno potrà più regnare,
 se non capisce gli avventurieri
A partir de agora, um governador precisará
Ныне любому правителю необходимо наладить
взаимопонимание с авантюристами.